Warp stop-motion for looms



(No Model.) 2 Sheets--Sheet 1.

J. H. NORTHROP. WARP STOP MOTION POR LOOMS.

No. 594,355. v Patented Nov. 23,1897.

(No Model.) 2 sheetssheet 2. J H NORTHROP WARP STOP MOTIoN POR LOOMS.`

Patented Nov'. 23, 1897.

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UNITED STATES JAMES H. N ORTHROP, OF HOPEDALE,

MASSACHUSETTS, ASSIGNOR TO THE DRAPER COMPANY, OF SAME PLACE ANDPORTLAND, MAINE.

WARP STOP-MOTION FOR `I OOMS.

SPECIFICATION forming part of Letters Patent No. 594,355, dated November23, 1897.

applicati@ nea March 15,18'97.

To all whom t may concern,.-

Beit known that I, JAMES H. NoRrHRoP, of Hopedale, in the county ofWorcester and State of Massachusetts, have invented an Improvement inWarp Stop-Motions for Looms, of which the following description, inconnection with the accompanying drawings, is a specification, likeletters and figures on the drawings representing like parts.

This invention relates to that class of looms wherein breakage or undueslackness of the warp-threads is made effective throughstopmotion-actuatingdetectors to stop the loom, and in my presentinvention said detectors also serve as heddles. When the warps areunbroken or under propel` tension, the detectors are maintainedinoperative; but should a warp-threadl break or unduly slacken itsdetector will move into abnormal position to act upon devicesintermediate it and the stopping mechanism for the loom to stop thelatter.A

In my present invention I have provided each harness or heddle framewith two banks of detector-heddles, the latter being shown as fiatmetallic bars or strips hav ing each a warpeye, the Warp-thread enteringthe eye at one side of the heddle and passing therefrom at the other,the plane of the heddle being substantially parallel to the warp-thread.

By dividing the heddles in each frame into a plurality of banks I amenabled to weave cloth of close slay, while leaving ample room for thethreads and detector-heddles, without that closeness or proximity whichthe same number of heddles in a single bank would necessitate.

As a matter of fact on many goods the single banks or sets of heddlescannot be used without severely chafing the warp-threads, as there isnotroom enough for so many th reads and their heddles in one line.

Another important feature of my invention relates to the vibrator orfeeler which coperates with a dropped detector, the vibrator beinggoverned in its actuating position by the set of the harness-cam.

Other warp stop-motion devices have been so constructed that the set ofthe vibrator is independent of the harness-cam, the result being that achange in the set of the harness- Serial No. 627,545. (No model.)

cam is liable to cause the vibrator to operate improperly.

Weavers find it necessary in order to produce certain effects in theface of the cloth to beat up the filling with the sheds more or lessclosed, and it thus becomes necessary to so construct the warpstop-motion that it will be governed in its action to a certain extentby the harness-cam in order that a change in the set of the cam willeffect a corresponding change in the time of operation of the vibrator.I have herein attained this object by so connecting thevibrator-actuator to the harness-cam that the vibrator will alwaysoperate properly when the heddles are properly lowered, the properlowering of the heddles depending on the harness-cam.

Figure 1 is a rear elevation of a sufficient portion of a loom to Vbeunderstood with my present invention embodied therein. Fig. 2

is a vertical sectional view thereof, taken on v the irregular line a:Fig. 1, looking toward the right. Fig. 2tL is a detail taken below theline y y, Fig. 2, and enlarged, of the'vibrators and cooperatingback-stop for the detectors. Fig. 3 is an enlarged perspective view ofthe vibrator-actuator and the connections between said actuator and thereleasing device for the stopping mechanism of the loom. Fig. 4 is alongitudinal sectional view of the parts shown in Fig. 3, the cam-shaftbeing shown in elevation. Fig. 5 is a transverse sectional View on theline x Fig. 4, looking to the left. Fig. 6 is a similar view on line :c2x2, Fig. 4, but looking toward the right; and Fig. 7 is an enlargedhorizontal section taken through the two banks of detectorheddles, abovethe warp-eyes, to more clearly show the relative position of the heddlesand the manner of threading.

The lay is omitted from the drawings in order to simplify theconstruction and to more clearly show the relation of the partscomprising and cooperating with my invention.

The loom-frame A, of suitable shape to support the operating parts, thebreast-beam A40, harness-cam shaft O, the overhead connection betweenthe harness orheddle frames and comprising the shaft a, sheaves a', andflexible straps a2, and the cam-actuated treadles IOO T T', connectedwith the lower ends of the harness-frames, may be and are all of usualand well-known construction in looms.

The shipper-lever S, pivoted at 2 and held in a notch in the usualholding-plate S' against the action of the actuating-spring SX, is alsoof wellknown and ordinary construction, operating a beltshiftermechanism. (Not shown.)

A rock-shaft (L5 is supported in a bearing in the loom side and in abearing on a bracket (LX, secured to the cross-girt AX of the loomframe,said shaft having fast thereon a knockoff arm a to engage and releasethe shipperlever from its holding-notch at the proper time, the end ofthe arm being extended laterally to remain in engagement with the lever,as best shown in Fig. l.

The harness-cams C' C2 are mounted on a sleeve or hub c, suitablysecured to the camshaft C by bolts c', Fig. l, one end of the hub beingshown as provided with lugs c2 to enter notches in a sleeve d, fixed inadjusted position on the cam-shaft by a set-screw d. locking connectionis thus effected between the harness-cams and the sleeve (l, so that anychange in the set of the cams on the shaft C will effect a correspondingchange in the angular position of the sleeve, the set-screw d beingloosened for the purpose. Asecond sleeve f, loose on the cam-shaftbetween the inner end of the sleeve (l and a collar fX, is provided witha ratchet-wheel f at one end and at the other end, adjacent the collar,with annular flanges f2, (see Figs. 3, 4, and 6,) between which is acam-surface f3, having four points 3, Fig. 6, and intermediate lowportions.

The rock-shaft (t5 has fast thereon an arm (L7, to which is jointed ata8 a link a9, upwardly extended and bent or hooked at its upper end at(L10 to enter between the flanges f2 and convexed at (L12 to enter thelow portion of the cam f3 between two points 3. Now when the cam isrotated the points act upon the link (1,9 to move it in the direction ofthe arrow-1, Fig. G, a one-eighth turn ofthe cam from the positiontherein shown moving the link longitudinally to rock the shaft (t5sufliciently to relieve the shipper-lever S from its holding-notch.

Referring now to Fig. 3, the sleeve d has upon its exterior lugs (Z2,which provide bearings for a rock-shaft (Z3, to which is secured,between the lugs, the hub of a linger (Z4, a setscrew 6, holding the hubsecurely on the rockshaft. A spring s, secured at one end to the sleeved,bears against the linger and norm ally tends to throw the latter outor away from the sleeve, and to thereby maintain a toothed pawl (Z5 outof engagement with the ratchetwheelf. This pawl is loosely mounted onthe rock-shaft (Z3 opposite the ratchet-wheel and is pressed toward thelatter by a spring s', coiled around the rock-shaft, as herein shown,one end, 7, of said spring bearing against one of the lugs (l2 and itsother end, 8, bearing against the pawl-carrier. The latter has an ear(Z6 thereon to coperate with an ear e on a collar e', held fast on therock-shaft by a setscrew 9, and also preventing endwise movement of thepawl, so that the spring s, acting through the rock-shaft, collar c, andear e', normally presses the pawl outwardly against the action of theweaker spring s. When the latter is free to act, it operates to throwthe teeth of the pawl (Z5 into engagement with the ratchet-wheel f', sothat the latter and the sleeve If will partake of any rotative movementof the main sleeve d.

At its end near the harness-cams C C2, as herein shown, the sleeve (Zhas secured to or forming part of it a cam-disk g, (shown in sideelevation in Fig. 5,) the cam having a high portion g', a low portiong2, and a notch g3 at one end of the high portion, the notch beingentered by a segment g4 on the side of an arm g5, rigidly secured to therock-shaft (l3 by a suitable set-screw l0. The contour of the segment g4is such that it normally forms a continuation of the periphery of thecam-disk g, the springs s and s maintaining the segment in the relativeposition shown in Fig. 5.

A collar (ZS, suitably secured to the sleeve (l adjacent the cam-disk g,forms an annular recess between them, in which recess plays the end of alongitudinally-movable link 7L, slotted longitudinally at 7b to embracethe sleeve (Z and provided with studs or pins h2 7b3 to engage oppositeportions of the cam-periphery of disk g.

The link 7L is pivotally connected at h4 to a rocker-arm 7L, fast on arock-shaft h, mounted in suitable bearings in the loom-frame, and, asherein shown, having rigid yoke-arms hT, to the ends of which areattached two like and parallel vibrators or feelers 7a 7o' below thepaths of and to coperate with the warp stop-motion-actuating detectors mm', herein shown serving as heddles, the vibrators be- IOO IOS

IIO

ing shown as angle-irons, preferably having I their edges cooperatingwith the detectors notched as in Fig. 2.

Obviously the rotation of the cam-shaft C will, through the cani-disk g,acting upon the rolls or studs h2 h3, reciprocate the link h and therebyrock the shaft 7L, so that the vibrators or feelers 7a 7u will move backand forth unless such movement is prevented.

Referring to Figs. l and 2, the harness or heddle frames are shown aseach comprising a bottom bar mX, rigid side bars m2, and two top bars m3m3 in parallelism, the detectorheddles of cach frame being divided intotwo banks and supported in the top bars, which pass through thelongitudinal slots 22 near the upper ends of the detectors. A fiat plateor bar n, interposed between the lower vends of the detector-heddles ofthe two frames, prevents intermingling thereof and also serves as a stopfor a dropped heddle when engaged by a vibrator.

It will be understood that the heddles have a limited vertical movementindependent of the heddle-frames, owing to the slots 22 being longerthan the depth of the supportingbars 'm3, so that upon breakage or undueslackening of a warp-thread its detector-heddle will drop into positionbetween the separator n and one of the vibrators 7c or k', as the casemay be. Preferably the separator is provided with a foot nx, notched toreceive the edge of the dropped heddle and prevent it from twisting Whenengaged by the vibrator.

Referring to Fig. 7, it will be seen that the heddles in one bank of theframe are staggered relatively to the heddlesin the other bank, so thatthere is ample room for the heddles and their warp-threads withoutchafing the yarns entering the warp-eyes at one side of the heddle andpassing out along the other iiat side.

Only one vibrator is required for the plurality of banks or series ofdetector-heddles carried by the frame, as the lower ends of the heddlesare free to move, and the path of movement of the vibrator is sufficientto cooperate with a dropped heddle of either bank, though I may use morevibrators without departing from my invention.

l link being held from movement7 such segment will bev pressed towardthe center of the disk, thus rocking the shaft cl3. When the said shaftdi is rocked, the pawl d5 is thrown into engagement with theratchet-Wheel f', so that the sleeves d and f will rotate in unisonuntil the cam f3 is turned sufficiently to move the knocko-arm a6through the link a9, releasing the shipper-lever and stopping the loom.

Referring to Fig. 5, it is to be noted that the segment g4 can enter therecess g3 of the camdisk g, and that the travel of the cam and sleeve dfor an angular distance less than that between the ends of the recessg3v is sufficient to turn the cam f3 to cause release of theshipper-lever and consequent stoppage of the loom, but at the same timethe frame carrying the dropped detector has been raised sufficiently towithdraw the detector from between the separator 'n and vibrator,releasing the latter. As soon as the vibrator is released the spring sreturns the segment g4 to normal position, so that the stud on the linkh will not come in contact with the end of the recess g3, as thecam-disk g rotates, and the pawl and ratchet will also be disengaged.The front bar W5 prevents displacement of the detector-heddles of thefront frame, and also forms a warp-rest, and the rod n behind the backframe serves for a second warp-rest.

From the foregoing description it will be obvious that any change in theset of the harness-cams will cause a corresponding change in the set ofthe vibrator-actuating mechanism, whereby the vibrator will continue tooperate properly. It is also obvious that a single series of detectorscould be employed in each frame instead of a plurality of series orbanks, if desired, and in many instances such construction might be mostconvenient.

The direction of rotation of the cam-shaft C and parts carried therebyisindicated by the arrow 35, Figs. l, 2, 3, 5, and 6.

It will be noted that when the movable camsegment g1 is returned tonormal position, as described, the pawl d5 is disengaged from theratchet-wheel f', leaving the controlling-cam f3 for the knocko-arm a6free, and when the shipper-lever is returned to starting position thepull on the ln'k a9 will act to partially rotate the said cam intonormal position. (Shown in Fig. 6.)

Having fully described my invention, what I I claim, and desire tosecure by Letters Patent, is-

l. In a loom, a series of warp-stop-motionactuating detectors movableinto operative position by breakage or undue slackening of thewarp-threads, a vibrator to engage and be held by a dropped detector,mechanism to vertically reciprocate said detectors, means to normallyrock the vibrator, a rotatable shaft and controlling connections mountedadjustably on said shaft between said means and the mechanism forreciprocating the detectors, whereby adjustment of thedetectorreciprocating mechanism governs the timing of the means forrocking the vibrator, substantially as described.

2. In a loom, a series of warp-stop-motionactuating detectors movableinto operative position by breakage or undue slackness of thewarp-threads, a vibrator to engage and be stopped by a dropped detector,means to normally rock the vibrator, a harness-cam, and connectionsbetween it and said means, whereby the timing of the normal operation ofthe vibrator is controlled by the set of said cam on its shaft,substantially as described.

3. In a loom, a series of warp-stop-motionactuatingdetectors serving asheddles means, including harness-cams, to reciprocate said detectorsvertically, a vibrator to engage and be stopped by a dropped detectordue to breakage or undue slackening of its warp-thread; mechanism tonormally rock the vibrator, and connections between said mechanism andthe harness-cams, whereby the set of the latter on their shaft controlsthe timing of the normal operation of the vibrator, substantially asdescribed.

4. In a loom, a series of warp-stop-motionactuatingdetectors servin gasheddles means, including adjustable harness-cams, to reciprocate saiddetectors vertically, a vibrator to engage and be stopped by a droppeddetector due to breakage or undue slackening of its warp-thread,mechanism to normally rock the IOO IIO

vibrator, connections between said mechanism and the harness-cams,whereby adjustment of the latter on their shaft will govern the timingof the former, stopping mechanism for the loom, and means to operate thestopping mechanism when a dropped detector is engaged by the vibrator,substantially as described.

5. In a loom, shed-forming mechanism, inclndin g detector-heddles, andadjustable cams to effect their vertical reciprocation,combined withstopping mechanism for the loom, including a vibrator to cooperate witha dropped heddle, and connections between said vibrator and said cams,whereby the set of the latter on their shaft governs the timing of thenormal operation of the vibrator, substantially as described.

6. In a warp stop-motion for looms, a camshaft, harness-cams adjustablethereon, a vibrator, actuating mechanism therefor, connections betweensaid mechanism and the cams, whereby adjustment of the latter on theirshaft will govern and adjust the timing of said mechanism, ashipper-lever, releasing mechanism therefor, and means to operate itupon stoppage of the vibrator in its normal movement, substantially asdescribed.

7. ln a loom, warp-stop-motion-actuating detectors, a vibrator to engagea dropped detector, mechanism to normally rock said vibrator, includinga cam having a movable segment, and a link reciprocated bythe cam,combined with a shipper-lever, a releasing device therefor, and meansoperative upon movement of the cam-segment into abnormal position toactuate the releasing device, substantially as described.

S. In a loom, a rock-shaft having a vibrator mounted thereon, a link torock said shaft and provided with a roll or stud, a coperatingactuating-cam having a spring-controlled segment, and a normallyinoperative pawl, combined with a shipper-lever, and releasing `meanstherefor, including a controlling-cam and a ratchet-wheel, stoppage ofthe vibrator, acting to move the cam-segment and bring the pawl intoengagement with the ratchetwheel, to thereby rotate the controlling-camin unison with the actuating-cam, substantially as described.

9. In a loom, a rotatable shaft, a fast and a loose sleeve thereon, thelatter having a ratchet-wheel, a shipper-lever, and means to release itupon rotation of the loose sleeve, combined with a cam on the fastsleeve, having a recessed periphery, a spring-controlled segment movablein the recess, a pawl for the ratchet-wheel, controlled by said segmentand pivotally mounted on the fast sleeve, and means operative uponfailure of a warpthread to move said segment, and effect the stoppage ofthe loom, substantially as described.

10. In a loom, the harness-cam shaft, harness-cams adjustable thereon, aconnected cam having a recessed periphery, a movable segment therein,means operative upon failure of a warp-thread to move said segment, ashipper-lever, and releasing devices operated by movement of thecam-segment into abnormal position, substantially as described.

l1. In a loom, the harness-cam shaft, harness-cams adjustable thereon, aconnected cam having a recessed periphery, a movable segment therein,and means operative upon failure of a warp-thread to move the segment,said means including a series of detector-heddles moved into operativeposition upon breakage or undue slackening of the warpthreads, acooperating vibrator, and connections between it and the recessed cam,combined with a shipperlever, and releasing means therefor operated bymovement of the cam-segment into abnormal position due to stoppage ofthe vibrator by a dropped heddle, substantially as described.

12. In a loom,a heddle-frame provided with a plurality of adjacentcross-bars in parallelism, and a series of fiat metallic heddlessupported upon each of said bars and adapted to be moved verticallyindependently thereof, the heddles of one series being staggeredrelatively to the heddles of an adjacent series, combined with a commonvibrator movable in the direction of the length of the warpthreads, toengage and be stopped by a dropped detector of a series, means toreciprocate said heddle-frames vertically, and mechanism controlledthereby as to its normal operation, to rock the vibrator when thewarpthreads areintact, substantially as described.

13. In a loom, a harness-frame having a plurality of adjacentcross-bars, series of heddles having each a warp-eye and an elongatedslot near its end, each bar supporting a series of heddles, and avibrator having its axis of motion at right angles to the length of thewarp, to cooperate with a dropped heddle and be stopped thereby,combined with means to reciprocate said harness-frame vertically,vibrator-actuating mechanism, stopping mechanism for the loom controlledthereby, and connections between said actuating mechanism and the meansto reciprocate the harnessframe, whereby a change in the timing of thelatter will effect a corresponding change in the timing of the former,substantially as described.

14. In a loom, a series of vertically-movable warp-stop-motion-actuatingdetectors, and avibrator movable in the direction of the length of thewarp-threads and adapted to engage a dropped detector, combined withmeans to move said vibrator back and forth in the direction of thelength of the warp, said means including an actuating-cam, and aconnected cam to control the vertical reciprocation of the detectors,variation in the set of the latter cam acting to adjust the timing ofthe vibrator, substantially as described.

15. In aloom, shed-forming mechanism, including detector-heddles andcam-actuated means to reciprocate them, a vibrator mov- IOO IIO

ab1e in the direction of the length of the warp- In testimony whereof Ihave signed my threads, to cooperate With a dropped detector, name tothis specification in the presence of 1o stopping mechanism for the100m, operative tWo subscribing Witnesses. upon engagement of thevibrator with a de- 5 tector, and connections between the said cam-JAMES H' NORTHROP actuated means and the Vibrator, to control Witnesses:the normal vibration of the latter, substann HERBERT S. MANLEY, tiallyas described. GEO. OTIS DRAPER.

